core: elf_load: R_ARM_ABS32/R_AARCH64_ABS64 relocations against undefined symbol

The symbol referenced by a R_ARM_ABS32 or R_AARCH64_ABS64 relocation
may very well be external to the binary being relocated (for example,
defined in a shared library). In this case, the section table index for
the symbol is SHN_UNDEF and we need to perform process-wide symbol
resolution.

This fixes an issue I found when linking a TA against a shared version
of libutee (this configuration is introduced in a later commit). In this
case, ta_head::entry is set to __utee_entry which is in libutee.so,
hence undefined in the TA binary.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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